Energy-saving environment-friendly variable-frequency freezing dryer

Abstract

The invention belongs to the technical field of refrigeration dryers, and provides an energy-saving environment-friendly variable-frequency refrigeration dryer which comprises a refrigeration dryer body, a steam-water separator, a drainer, a heat exchanger, a refrigerant evaporator, a refrigerant compressor and a cooling fan are fixedly mounted in the refrigeration dryer body, and an air pretreatment chamber is fixedly mounted at the top in the refrigeration dryer body. In order to solve the technical problem that the filtering effect of a filtering partition plate is gradually reduced due to the fact that the filtering partition plate cannot be cleaned in time in the prior art, through cooperative use of a movable first baffle and a movable second baffle, opening and closing of a through groove are achieved, and dynamic isolation and closing of the upper space and the lower space in the air pretreatment chamber are achieved; the method and the device can be widely applied to use scenes of air filtration.

Description

Technical Field

[0001] The invention belongs to the technical field of cold dryers, and in particular relates to an energy-saving and environment-friendly variable frequency cold dryer. Background Art

[0002] Cold dryer is the abbreviation of refrigerated dryer. Cold dryer adopts new technology and belongs to the air source processing component in the pneumatic system. Cold dryer uses refrigerant to exchange heat with compressed air to reduce the temperature of compressed air to the dew point temperature.

[0003] Traditional cold dryers lack air pretreatment measures. When dust and impurities in the air enter the interior of the cold dryer, it is easy to cause friction between the internal components of the cold dryer, which in turn leads to increased energy consumption of the cold dryer and even malfunctions. In response to the above technical problems, a Chinese patent with patent announcement number CN210057838U is provided with a conveyor belt inside the air pretreatment unit when in use, and two groups of air filter baffles are fixed thereon. When cleaning the air pretreatment unit, the two groups of air filter baffles can be rotated and replaced by the conveyor belt, and then the replaced air filter baffles can be cleaned through the rectangular opening at the bottom of the air pretreatment unit. However, during the use of the filter baffle, the impurities on the filter baffle gradually increase, and the filter baffle cannot be cleaned in time, resulting in a gradual decrease in the filtering effect of the filter baffle, thereby reducing the quality of air entering the cold dryer. Summary of the invention

[0004] The object of the present invention is to provide an energy-saving and environment-friendly variable frequency cold dryer, aiming to solve the technical problem in the prior art that the filter baffle cannot be cleaned in time, resulting in a gradual decrease in the filtering effect of the filter baffle.

[0005] The present invention is implemented as follows: an energy-saving and environmentally friendly variable frequency cold dryer comprises a cold dryer body, a steam-water separator, a drainer, a heat exchanger, a refrigerant evaporator, a refrigerant compressor and a cooling fan are fixedly installed in the cold dryer body, and an air pretreatment chamber is fixedly installed on the top of the cold dryer body;

[0006] Both ends of the air pretreatment chamber are semicircular structures and a conveyor belt is arranged therein. A rotating power part for driving the conveyor belt to rotate is fixedly installed on the outer side of the air pretreatment chamber. Multiple groups of evenly distributed support plates are fixedly installed on the surface of the conveyor belt. When the conveyor belt rotates, the end of the support plate slides in contact with the inner wall of the air pretreatment chamber. A through slot is opened on the support plate. A first filter is fixedly installed on one side of the through slot. Multiple groups of second baffles distributed at intervals are fixedly installed on the side of the through slot away from the first filter. A bracket is fixedly installed on the surface of the support plate away from the first filter. A slide plate is slidably installed on the bracket. Multiple groups of first baffles distributed at intervals are fixedly installed on the slide plate. The first baffle is in sliding contact with the support plate. The first baffle and the second baffle form a complete plane of the closed through slot. A second magnet is fixedly installed on the first baffle away from the conveyor belt. Both ends of the air pretreatment chamber are fixedly installed with first magnets of semicircular structure. The first magnet and the second magnet have opposite surface magnetic poles close to each other. The two ends of the air pretreatment chamber are respectively connected with an inlet pipe and an outlet pipe, and the outlet pipe is connected to the heat exchanger. A cleaning component is arranged at the bottom of the air pretreatment chamber.

[0007] Further technical solution: A limit plate for limiting the position of the first baffle is fixedly installed on one end of the support plate away from the conveyor belt.

[0008] Further technical solution: A rotating frame with a frame-type structure is rotatably installed on the side of the support plate away from the bracket, and the rotation axis of the rotating frame is located on the side of the first filter close to the conveyor belt. When the rotating frame contacts the support plate, the first filter is located in the rotating frame, and a second filter is fixedly installed on the side of the rotating frame away from the support plate.

[0009] Further technical solution: A first guide plate is fixedly installed in the rotating frame, the first guide plate is parallel to the second filter screen and the end of the first guide plate close to the rotating frame shaft is spaced from the rotating frame, and the end of the first guide plate away from the rotating frame is provided with an inclined structure bent toward the side of the rotating frame.

[0010] Further technical solution: Multiple groups of second guide plates are fixedly installed in the rotating frame, the multiple groups of second guide plates are parallel to each other, the second guide plates are set at an angle with the first guide plates and there is a gap between the second guide plates and the first guide plates, and the air passing through the first filter moves in a direction away from the rotating axis of the rotating frame after contacting the first guide plates.

[0011] Further technical solution: A third baffle is fixedly installed on the support plate, and an angle is set between the third baffle and the support plate. When the support plate is in a vertical state and the angle between the third baffle and the support plate opens upward, the end surface of the rotating frame is completely in contact with the third baffle.

[0012] Further technical solution: The cleaning component includes an air pump and a third magnet, the third magnet is fixedly mounted on the bottom surface of the air pretreatment chamber, the length of the third magnet is the same as the distance between the two sets of support plates, the third magnet and the second magnet have the same surface magnetic poles close to each other, the air pump is fixedly mounted on the bottom surface of the air pretreatment chamber, the air inlet end of the air pump is connected to the air pretreatment chamber, and when the support plate moves horizontally, it passes through the connection position between the air pump and the air pretreatment chamber and the third magnet in sequence, and a through hole is opened on the air pretreatment chamber.

[0013] Further technical solution: a hair dryer is fixedly installed on the outer side of the air pretreatment chamber, the air outlet of the hair dryer is connected to the through hole, and the projection of the through hole to the bottom surface of the air pretreatment chamber is close to the end of the third magnet away from the vacuum pump.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The opening and closing of the through slot are realized by cooperating with the movable first baffle and the second baffle. When the support plate moves to the end of the air pretreatment chamber, the first baffle and the second baffle form a complete plane of the closed through slot, so that air cannot pass through the support plate. The speed of closing the through slot is accelerated by the first magnet and the second magnet, and the movement of the first baffle is prevented under the action of the magnetic force, so as to ensure the stability of the closure of the through slot on the support plate, thereby realizing the dynamic isolation and closure of the upper space and the lower space in the air pretreatment chamber, realizing the non-stop cleaning of the first filter, improving the timeliness of the cleaning of the first filter, and improving the quality of the air entering the cold dryer body.

[0016] 2. When the conveyor belt drives the support plate to move to the end of the air pretreatment chamber close to the air outlet pipe, when the support plate rotates to a set angle with the horizontal plane, the rotating frame rotates to separate from the third baffle and sticks to the support plate under the action of gravity. When the support plate moves to the air outlet pipe position and crosses the air outlet pipe, the flow of air will carry the impurities on the first filter screen and filter the impurities carried by the air through the rotating frame and the second filter screen, thereby preventing the impurities filtered by the first filter screen from entering the air outlet pipe with the air, further improving the quality of air entering the cold dryer body.

[0017] 3. The support plate where the first filter to be cleaned is located and the two adjacent support plates form a first cavity and a second cavity. The hair dryer transports air into the first cavity, and the vacuum pump extracts air in the second cavity, so that the air in the first cavity can enter the through groove and pass through the first filter. The air that passes through the first filter will push the rotating frame to rotate away from the support plate through the first guide plate. The air can clean the first filter when passing through the first filter. The cleaned impurities move downward with the air and are extracted by the vacuum pump, thereby achieving timely cleaning of impurities on the first filter. The second guide plate is used to further guide the flow of air so that impurities can move downward better. At the same time, the power of the air blower and the vacuum pump can change the thrust of the air on the rotating frame, thereby enabling the rotating frame to collide with the support plate, causing the first filter to vibrate, further improving the cleaning effect of impurities on the first filter, ensuring the filtering effect of the first filter on the air, and further improving the air quality entering the cold dryer body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure inside the cold dryer body of the present invention.

[0019] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 3 Schematic diagram of the internal structure of the air pretreatment chamber in the present invention.

[0021] Figure 4 It is a schematic diagram of the structure of the air pretreatment chamber in the present invention.

[0022] Figure 5 It is the front view of the air pretreatment chamber in the present invention.

[0023] Figure 6 It is a schematic diagram of the structure of the transmission belt in the present invention.

[0024] Figure 7 It is a structural schematic diagram of the support plate in the present invention.

[0025] Figure 8 for Figure 5 A magnified schematic diagram of the A1 region in the middle.

[0026] Fig. 9 for Figure 5 A magnified schematic diagram of the A2 region in the middle.

[0027] In the attached drawings: 1. cold dryer body; 2. air pretreatment chamber; 3. first magnet; 4. transmission belt; 5. rotating power part; 6. support plate; 7. through groove; 8. first filter; 9. bracket; 10. slide plate; 11. first baffle; 12. second baffle; 13. second magnet; 14. limit plate; 15. rotating frame; 16. second filter; 17. first guide plate; 18. second guide plate; 19. third baffle; 20. air inlet pipe; 21. air outlet pipe; 22. hair dryer; 23. third magnet; 24. vacuum pump; 25. cleaning component. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0030] like Figure 1-Figure 9 As shown, an energy-saving and environmentally friendly variable frequency cold dryer provided by the present invention comprises a cold dryer body 1, in which a steam-water separator, a drainer, a heat exchanger, a refrigerant evaporator, a refrigerant compressor and a cooling fan are fixedly installed, and an air pretreatment chamber 2 is fixedly installed on the top of the cold dryer body 1;

[0031] Both ends of the air pretreatment chamber 2 are semicircular structures and a conveyor belt 4 is arranged therein. A rotating power part 5 for driving the conveyor belt 4 to rotate is fixedly installed on the outer side of the air pretreatment chamber 2. A plurality of evenly distributed support plates 6 are fixedly installed on the surface of the conveyor belt 4. When the conveyor belt 4 rotates, the end of the support plate 6 slides in contact with the inner wall of the air pretreatment chamber 2. A through groove 7 is opened on the support plate 6. A first filter screen 8 is fixedly installed on one side of the through groove 7. A plurality of groups of spaced second baffles 12 are fixedly installed on the side of the through groove 7 away from the first filter screen 8. A bracket 9 is fixedly installed on the surface of the support plate 6 away from the first filter screen 8. A slide plate 10 is slidably installed on the bracket 9. A plurality of groups of spaced first baffles 11 are fixedly installed on the slide plate 10. The first baffle 11 and the support plate 6 sliding contact, the first baffle 11 and the second baffle 12 form a complete plane of the closed through groove 7, the first baffle 11 away from the conveyor belt 4 is fixedly mounted with a second magnet 13, and the end of the support plate 6 away from the conveyor belt 4 is fixedly mounted with a limit plate 14 for limiting the position of the first baffle 11, both ends of the air pretreatment chamber 2 are fixedly mounted with a first magnet 3 with a semicircular structure, the surface magnetic poles of the first magnet 3 and the second magnet 13 close to each other are opposite, the two ends of the air pretreatment chamber 2 are respectively connected with an air inlet pipe 20 and an air outlet pipe 21, the air outlet pipe 21 is connected to the heat exchanger, the position where the air outlet pipe 21 is connected to the air pretreatment chamber 2 is located at the end semicircular structure of the air pretreatment chamber 2, and a cleaning component 25 is arranged at the bottom of the air pretreatment chamber 2.

[0032] In actual application of this embodiment, the conveyor belt 4 is driven to rotate slowly by the rotating power member 5, and the air enters the air pretreatment chamber 2 from the air inlet pipe 20. The first baffle 11 located above the conveyor belt 4 is located at the bottom of the bracket 9 due to the effect of gravity. At this time, the first baffle 11 overlaps with the second baffle 12, and the through slot 7 is in an open state. At this time, the air flow speed is greater than the rotation speed of the conveyor belt 4, so that the air will pass through the multiple groups of first filter screens 8 in sequence and then leave the air pretreatment chamber 2 from the air outlet pipe 21. The treated air enters the cold dryer body 1 for treatment;

[0033] When the support plate 6 above the conveyor belt 4 rotates to the end of the air pretreatment chamber 2 and the support plate 6 tilts downward, the first baffle 11 moves toward the direction close to the limit plate 14 under the action of gravity and the magnetic force of the first magnet 3 and the second magnet 13 until it contacts the limit plate 14. At this time, the first baffle 11 and the second baffle 12 form a complete plane of the closed through groove 7, so that air cannot pass through the support plate 6. The speed of closing the through groove 7 is accelerated by the first magnet 3 and the second magnet 13, and the first baffle 11 is prevented from moving under the action of the magnetic force, thereby ensuring the stability of the closure of the through groove 7 on the support plate 6. When the first filter screen 8 moves horizontally under the conveyor belt 4, it is cleaned by the cleaning assembly 25. When the support plate 6 under the conveyor belt 4 rotates to the end of the air pretreatment chamber 2, the first baffle plate 11 and the second baffle plate 12 form a complete plane of the closed through groove 7. At this time, the first baffle plate 11 is prevented from moving under the action of magnetic force, thereby ensuring the stability of the closure of the through groove 7 on the support plate 6, thereby realizing the dynamic isolation and closure of the upper space and the lower space in the air pretreatment chamber 2, realizing the non-stop cleaning of the first filter screen 8, improving the timeliness of the cleaning of the first filter screen 8, and improving the quality of the air entering the cold dryer body 1.

[0034] In an example of this embodiment, the rotating power component 5 is a motor, and of course it can also be other components that can output rotating power, such as a hydraulic motor, and the transmission belt 4 is driven to rotate by the motor.

[0035] like Figure 1-Figure 5 As shown, an energy-saving and environmentally friendly variable frequency cold dryer provided by the present invention, a rotating frame 15 of a frame-type structure is rotatably installed on the side of the support plate 6 away from the bracket 9, and the rotation axis of the rotating frame 15 is located on the side of the first filter 8 close to the conveyor belt 4. When the rotating frame 15 contacts the support plate 6, the first filter 8 is located in the rotating frame 15, and a second filter 16 is fixedly installed on the side of the rotating frame 15 away from the support plate 6.

[0036] Specifically, a first guide plate 17 is fixedly installed in the rotating frame 15, the first guide plate 17 is parallel to the second filter screen 16, and an end of the first guide plate 17 close to the rotating axis of the rotating frame 15 is spaced from the rotating frame 15, and an end of the first guide plate 17 away from the rotating frame 15 is provided with an inclined structure bent toward the side of the rotating frame 15.

[0037] Specifically, a plurality of groups of second guide plates 18 are fixedly installed in the rotating frame 15, and the plurality of groups of second guide plates 18 are parallel to each other. An angle is set between the second guide plates 18 and the first guide plates 17, and a gap is set between the second guide plates 18 and the first guide plates 17. The air passing through the first filter 8 moves in a direction away from the rotating axis of the rotating frame 15 after contacting the first guide plates 17.

[0038] Specifically, a third baffle 19 is fixedly mounted on the support plate 6 , and an angle is formed between the third baffle 19 and the support plate 6 . When the support plate 6 is in a vertical state and the angle between the third baffle 19 and the support plate 6 is facing upward, the end surface of the rotating frame 15 is completely in contact with the third baffle 19 .

[0039] In actual application of this embodiment, when the support plate 6 is located below the conveyor belt 4, the rotating frame 15 is in a vertical state. When the support plate 6 rotates to the top of the conveyor belt 4, the support plate 6 is closely attached to the third baffle plate 19 under the action of gravity. At this time, air can pass through the first filter screen 8. When the conveyor belt 4 drives the support plate 6 to move to the end of the air pretreatment chamber 2 close to the outlet pipe 21, when the support plate 6 rotates to a set angle with the horizontal plane, the rotating frame 15 rotates away from the third baffle plate 19 and closely attaches to the support plate under the action of gravity. 6, at this time, the support plate 6 has not moved to the position of the air outlet pipe 21, and the air can still pass through the first filter screen 8 and the second filter screen 16 into the air outlet pipe 21. When the support plate 6 moves to the position of the air outlet pipe 21 and crosses the air outlet pipe 21, at this time, the flow of air will carry the impurities on the first filter screen 8 to move, and the impurities carried by the air are filtered by the rotating frame 15 and the second filter screen 16, thereby preventing the impurities filtered on the first filter screen 8 from following the air into the air outlet pipe 21, and further improving the quality of the air entering the cold dryer body 1.

[0040] like Figure 4 , Fig. 9 As shown, an energy-saving and environmentally friendly variable frequency cold dryer provided by the present invention, the cleaning component 25 includes an exhaust pump 24 and a third magnet 23, the third magnet 23 is fixedly mounted on the bottom surface of the air pretreatment chamber 2, the length of the third magnet 23 is the same as the distance between the two groups of support plates 6, the third magnet 23 and the second magnet 13 have the same surface magnetic poles close to each other, the exhaust pump 24 is fixedly mounted on the bottom surface of the air pretreatment chamber 2, the air inlet end of the exhaust pump 24 is connected to the air pretreatment chamber 2, and when the support plate 6 moves horizontally, it passes through the connection position between the exhaust pump 24 and the air pretreatment chamber 2 and the third magnet 23 in sequence, and a through hole is opened on the air pretreatment chamber 2.

[0041] Specifically, a hair dryer 22 is fixedly installed on the outer side of the air pretreatment chamber 2, and the air outlet end of the hair dryer 22 is connected to the through hole. The projection of the through hole 22 to the bottom surface of the air pretreatment chamber 2 is close to the end of the third magnet 23 away from the vacuum pump 24.

[0042] In actual application of this embodiment, the hair dryer 22 and the air pump 24 are turned on. When the support plate 6 moves to the top of the third magnet 23, the first baffle 11 moves upward and overlaps with the second baffle 12 under the magnetic force of the second magnet 13 and the third magnet 23. At this time, the through groove 7 is in a connected state. The support plate 6 where the first filter 8 to be cleaned is located and the two adjacent groups of support plates 6 form a first cavity and a second cavity. The hair dryer 22 transports air into the first cavity, and the air pump 24 extracts air from the second cavity, so that the air in the first cavity can enter the through groove 7 and pass through the first filter 8. The air passing through the first filter 8 will push the rotating frame 15 to rotate away from the support plate 6 through the first guide plate 17. When the air passes through the first filter 8, the first filter 8 can be cleaned. The cleaned impurities move downward with the air and are extracted by the vacuum pump 24, thereby realizing timely cleaning of impurities on the first filter 8. The flow of air is further guided by the second guide plate 18, so that the impurities can move downward better. At the same time, the power of the air blower 22 and the vacuum pump 24 can change the thrust of the air on the rotating frame 15, so that the rotating frame 15 can collide with the support plate 6, causing the first filter 8 to vibrate, further improving the cleaning effect of the impurities on the first filter 8, ensuring the filtering effect of the first filter 8 on the air, and further improving the air quality entering the cold dryer body 1.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An energy-saving and environment-friendly variable frequency cold dryer, comprising a cold dryer body (1), wherein a steam-water separator, a drainer, a heat exchanger, a refrigerant evaporator, a refrigerant compressor and a cooling fan are fixedly installed in the cold dryer body (1), characterized in that: An air pretreatment chamber (2) is fixedly installed on the top of the cold dryer body (1); Both ends of the air pretreatment chamber (2) are semicircular structures and a conveyor belt (4) is arranged therein. A rotating power part (5) for driving the conveyor belt (4) to rotate is fixedly installed on the outer side surface of the air pretreatment chamber (2). A plurality of evenly distributed support plates (6) are fixedly installed on the surface of the conveyor belt (4). When the conveyor belt (4) rotates, the end of the support plate (6) is in sliding contact with the inner wall of the air pretreatment chamber (2). A through groove (7) is provided on the support plate (6). A first filter screen (8) is fixedly installed on one side of the through groove (7). A plurality of intervally distributed second baffles (12) are fixedly installed on the side of the through groove (7) away from the first filter screen (8). A bracket (9) is fixedly installed on the surface of the support plate (6) away from the first filter screen (8). A sliding plate (12) is slidably installed on the bracket (9). The slide plate (10) is fixedly mounted with a plurality of first baffles (11) distributed at intervals, the first baffles (11) are in sliding contact with the support plate (6), the first baffles (11) and the second baffles (12) form a complete plane of a closed through groove (7), the first baffle (11) away from the conveyor belt (4) is fixedly mounted with a second magnet (13), both ends of the air pretreatment chamber (2) are fixedly mounted with a first magnet (3) of a semicircular structure, the surface magnetic poles of the first magnet (3) and the second magnet (13) close to each other are opposite, the two ends of the air pretreatment chamber (2) are respectively connected with an air inlet pipe (20) and an air outlet pipe (21), the air outlet pipe (21) is connected to a heat exchanger, and a cleaning component (25) is arranged at the bottom of the air pretreatment chamber (2).

2. The energy-saving and environmentally friendly variable frequency cold dryer according to claim 1, characterized in that: A limiting plate (14) for limiting the position of the first baffle (11) is fixedly mounted on one end of the support plate (6) away from the conveyor belt (4).

3. The energy-saving and environmentally friendly variable frequency cold dryer according to claim 1, characterized in that: A rotating frame (15) of a frame-type structure is rotatably mounted on the side of the support plate (6) away from the bracket (9); the rotation axis of the rotating frame (15) is located on the side of the first filter screen (8) close to the conveyor belt (4); when the rotating frame (15) contacts the support plate (6), the first filter screen (8) is located inside the rotating frame (15); and a second filter screen (16) is fixedly mounted on the side of the rotating frame (15) away from the support plate (6).

4. The energy-saving and environmentally friendly variable frequency cold dryer according to claim 3, characterized in that: A first guide plate (17) is fixedly installed in the rotating frame (15), the first guide plate (17) is parallel to the second filter screen (16), and an end of the first guide plate (17) close to the rotating shaft of the rotating frame (15) is spaced from the rotating frame (15), and an end of the first guide plate (17) away from the rotating frame (15) is provided with an inclined surface structure bent toward the side of the rotating frame (15).

5. The energy-saving and environmentally friendly variable frequency cold dryer according to claim 4, characterized in that: A plurality of groups of second guide plates (18) are fixedly installed in the rotating frame (15), the plurality of groups of second guide plates (18) are parallel to each other, an angle is formed between the second guide plates (18) and the first guide plates (17), and a gap is formed between the second guide plates (18) and the first guide plates (17), and air passing through the first filter screen (8) moves in a direction away from the rotating shaft of the rotating frame (15) after contacting the first guide plates (17).

6. The energy-saving and environmentally friendly variable frequency cold dryer according to claim 5, characterized in that: A third baffle (19) is fixedly mounted on the support plate (6), and an angle is formed between the third baffle (19) and the support plate (6). When the support plate (6) is in a vertical state and the angle between the third baffle (19) and the support plate (6) is opened upward, the end surface of the rotating frame (15) is completely in contact with the third baffle (19).

7. The energy-saving and environmentally friendly variable frequency cold dryer according to claim 1, characterized in that: The cleaning assembly (25) comprises an air pump (24) and a third magnet (23), wherein the third magnet (23) is fixedly mounted on the bottom surface of the air pretreatment chamber (2), the length of the third magnet (23) is the same as the distance between the two groups of support plates (6), the surface magnetic poles of the third magnet (23) and the second magnet (13) close to each other are the same, the air pump (24) is fixedly mounted on the bottom surface of the air pretreatment chamber (2), the air inlet end of the air pump (24) is connected to the air pretreatment chamber (2), and the support plate (6) passes through the connection position between the air pump (24) and the air pretreatment chamber (2) and the third magnet (23) in sequence when moving horizontally, and a through hole is opened on the air pretreatment chamber (2).

8. The energy-saving and environmentally friendly variable frequency cold dryer according to claim 7, characterized in that: A hair dryer (22) is fixedly mounted on the outer side of the air pretreatment chamber (2); the air outlet end of the hair dryer (22) is connected to the through hole; the projection of the through hole onto the bottom surface of the air pretreatment chamber (2) is close to the third magnet (23) and away from the end of the air pump (24).

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